i) Backrooms Sublevel 1-4 - teia

Deep entry of Level 1, this is an evil twin of first layer, accessible via unfortunate string of events. Use W,A,D or arrow keys or HUD arrows to walk. Space for zoom-in, R for restarting scene. twitter.com/PlyLop

Inside the Backrooms - Backrooms Top Survivor + Achievement Guide

Level 1, Enter The Backrooms Wiki

How to make and submit your OWN Backrooms Level! (Official

Level List, Backrooms Wiki

Sublevel 0.1, Backrooms Unlimited Wiki

Sublevel 1.5, Backrooms Unlimited Wiki

The Backrooms - Level Negative 1 - #4 by TheWTFage on DeviantArt

Level List, Backrooms Wiki

Level 4, Backrooms Unlimited Wiki